You ask me ( and nobody did ) QT has been steadily sliding down the idiot hill.
Reservoir Dogs - Brilliant and different
Pulp Fiction -- Wild, brilliant, unhinged and different
Jackie Brown -- Eh.
Kill Bill 1 & 2 -- Brilliantly done, derivative of all the cheesy Japanese vengeance movies but spun well
Grindhouse/Deathproof -- Ok. We've seen this before. A shitty movie is a shitty movie even when you mean for it to be shitty. This is the cinematic equivalent of Limp Bizkit music.
Inglorious Basterds -- Same formula, some good individual performances but we've seen it already.
In terms of quality his films have slowly slid downward.
Kill Bill (which I love) is slightly less than Pulp Fiction. The drop from Bill to Grindhouse was falling-off-the-cliff level.